<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>旋转数组</title>
</head>

<body>
  <script>
    function arr(a, b) {
      for (let i = 0; i < b; i++) {
        //在开头添加和删除
        a.unshift(a.pop())
      }
      return a
    }
    console.log(arr([1, 2, 3, 4, 5, 6, 7, 8, 9], 5))
  </script>
</body>

</html>